Flip stop



FIG. 1 is a perspective view of a flip stop showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view being a mirror image of the right side;

FIG. 3 is a top elevational view thereof.

FIG. 4 is a bottom elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a front elevational view thereof.

The broken line representations of portions of the flip stop in FIGS. 1-6 do not limit the claimed design. 

The ornamental design for a flip stop, as shown and described. 